The story
It was founded as California Computer Products, Inc in 1959, located in Anaheim, California.
Sanders Associates, Inc., purchased Calcomp in 1980. In 1986, Sanders Associates was purchased by the Lockheed Corporation, and merged into Lockheed's Information Systems Group. Lockheed kept CalComp as a brand name.
Shutdown
Calcomp Technology shut down its operations in 1999, and transferred different product lines to various other companies, some of whom continue to use the "Calcomp" or other "Cal-" trademarks:
Technical Services and spare parts: CalGraph Technology Services, Inc.
TechJet 5500 Large Format Inkjet Plotter / Printer Information: CalComp Graphics.
Digitizer, Tablets and scanners: GTCO CalComp, Inc.
Film Imaging Systems: EcoPro Imaging (now part of OYO Instruments)
Cutter and sign maker products: Westcomp
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Products
It produced a wide range of plotters (both drum and flat-bed), digitizers, thermal transfer color printers, thermal plotters (InfoWorld June 13, 1994 p. 40) and other graphic input/output devices. In 1969, it produced about 80% of all plotters worldwide.
It also produced IBM plug compatible (PCM) disk and tape products. The disk products ranged from 2311 (CD-1,5, 17, 18, 24, 25) through 3350 equivalents. The tape product was a 3420 equivalent.
Calcomp acquired Talos and Summagraphics, which had acquired Houston Instruments.
From Wikipedia’s article on Calcomp, shared under CC BY-SA 4.0.4